ZyXEL ADSL2+ User Manual download pdf (Page 180)

Prestige 660RU-Tx Series User’s Guide

179 Chapter 22 Filter Configuration

Figure 117 Filter Rule Process

You can apply up to four filter sets to a particular port to block various types of packets.

Because each filter set can have up to six rules, you can have a maximum of 24 rules active for

a single port.

For incoming packets, your Prestige applies data filters only. Packets are processed depending

on whether a match is found. The following sections describe how to configure filter sets.

22.1.1 The Filter Structure of the Prestige

A filter set consists of one or more filter rules. Usually, you would group related rules, for

example, all the rules for NetBIOS, into a single set and give it a descriptive name. You can

configure up to twelve filter sets with six rules in each set, for a total of 72 filter rules in the

system.

Start

Fetch First

Filter Set

Fetch First

Filter Rule

Active?

Execute

Filter Rule

Fetch Next

Filter Rule

Next filter

Rule

Available?

Fetch Next

Filter Set

Next Filter Set

Available?

Accept PacketDrop Packet

Yes

Packet

intoFilter

Filter Set

Forward

Drop

Check

Rule

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ZyXEL ADSL2+ User Manual Page 180